Where is the tail light fuse located?

There is a fuse for this but this is for the multi function switch.

I would suggest testing the voltage from the switch to find out if it is functioning. However, if your headlights are working then the switch is working.

https://www.2carpros.com/articles/how-to-check-wiring

If the tail lights are the only thing not working then I would check for voltage at the lamps and then backtrack through the system until you find the voltage. There is a splice that I suspect may be the issue but let's start with this and go from there. Thanks